The HP 6433B is a regulated dc power supply utilizing all-silicon circuitry. Silicon-controlled rectifiers in series with the transformer primary, and controlled by the output voltage and current settings, accomplish the desired regulation using Harrison???s unique ???Ramp-Lock??? phase control circuit. This circuit technique permits a reduction in the overall size and weight of the power supply and results in up to 75% efficiency at full output. This SCR regulated power supply also features lower output ripple, tighter load and line regulation, and Constant Voltage/Constant Current operation with automatic crossover. Specifications. DC output: 0-35VDC / 0-10A. Line regulation, for a 10% change in the nominal: 18 mV (Constant voltage), 100 mA (Constant current),. Constant current load regulation: for a change in output voltage from no load to full load or full load to no load. 100 mA. Fu!l Scale meter readings, meters have 2% accuracy (meter has calibrating potentiometer): 40 V & 12 A. Transient recovery time, less than 200 ms for output recovery to within "A" mV; transient amplitude less than "B" volts/amp for any load change between 20% and 99% of rated output current: A = 200, B = 0.5. Ripple and noise: 36 mV rms maximum.